I have finished packing my suitcase finished pack 为什么是doing?

I have finished packing my suitcase finished pack 为什么是doing? I have just finished it pack the suitcase是什么意思,箱子怎么打包?原句是I haven't finished packing my suitcase i have finished可否省略have I have finished the essay at last. I have finished my homework.反义疑问句 I won't lend you the book before I have finished it.为什么用have finished 请问这句应该是have finished还是finished?The moment I （have） finished I’ll give you a call. I have packed the camera.When_____you_____it?A.have;packed B.do;pack C.already D.yet I have already finished homework.have可以不要吗? Have you finished your homework Yes,I __it in twenty minutes.选 A.have finished 还是 B.finished 为什么? i have finished my homework,为什麼不i had? I have finished my homework before I ______(leave). 可是说i am finished吗?为什么是finished?这是什么时态?跟i have finished有什么差别? I have already finished my homework.(变否定句) I _____ finished my homework ______. I have finished my homework.和“I finished my homework.有区别吗? I have finished my homework.可否这么说 I finished my homework.为什么 i am finished和i have finished倒底一样不一样